This bar chart displays the populations of the top 10 most populous countries, based on 2018 estimates from the United Nations World Population Prospects. The visualization uses D3 v5 with SVG rendering, employing `d3.scaleLinear` for the x-axis and `d3.scaleBand` for the categorical y-axis. Customized axes are created with `d3.axisLeft` and `d3.axisBottom`, where tick labels are formatted to show population in billions and the x-axis includes negative tick lines. The code loads data from a CSV using `d3.csv`, parses population values, and appends rectangles plus axis labels dynamically.